386509987 has 4 divisors (see below), whose sum is σ = 386661640. Its totient is φ = 386358336.

The previous prime is 386509927. The next prime is 386510021. The reversal of 386509987 is 789905683.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 386509987 - 2⁷ = 386509859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (386509927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71937 + ... + 77122.

It is an arithmetic number, because the mean of its divisors is an integer number (96665410).

Almost surely, 2^386509987 is an apocalyptic number.

386509987 is a deficient number, since it is larger than the sum of its proper divisors (151653).

386509987 is a wasteful number, since it uses less digits than its factorization.

386509987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151652.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The square root of 386509987 is about 19659.8572477015. The cubic root of 386509987 is about 728.4284619808.

The spelling of 386509987 in words is "three hundred eighty-six million, five hundred nine thousand, nine hundred eighty-seven".